Printing apparatus



May 27, 1924. 1,495,172

J. GONDEK PRINTING APPARATUS Filed Marchl'T. 1920 I Infieniar Patented May 27, 1924.

UNITED STATES PATENT :AO'FFICE.

JOHN GONDEK, OF ST. PAUL, MINNESOTA.

PRINTING APPARATUS.

Application filed March 17,1920. Serial No. 366,586.

To all whom it may concern: I

I the impressions therefrom and constitutes Be it known that I, JOHN GoNDEK, a citizen of the United States, and a resident of St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new.

and useful Improvements in a Printing Apparatus, of which the following is a specification. I

One object of my invention is to provide in a printing apparatus means by which inequalities in the printing faces of the type are compensated for, thereby making an even print and eliminating the hand-makeready that is ordinarily required, and thus provide a method for all grades of commercial and color printing done on a cylinder or rotary type press.

Incidental ob ects are to provide a com position covering for the first transfer cylinder of unique construction and also pro vide the second transfer cylinder with a covering which is interchangeable with the covering of the feed cylinder.

-In the drawing Flgure 1 1s a s1de eleva tion of a printing press showingthe bed, cylinders and actuating gear. Figure 2 is a section through the printing, transfer, and feed cylinders.

As shown in the drawings the frame work A supports a slidable typ'e bed 2 in the customary fashion, and jo-urnaled above the type bed is a horizontally disposed cylinder B which receives the printing impressions from the type in the type bed.

The cylinder C mounted parallel to the cylinder B and likewise journaled in the frame co-acts with the cylinder B to receive The general construction and operation of the machine is similar to that disclosed in my Patent 1,347,505, July 27, 1920, entitled Printing apparatus, and only such parts of the apparatus as have to do with my invention are shown and described, as all of the rest ofthe mechanism is perfectly. familiar to all those skilled in the art. 1

' The cylinders B, O and D and thetygg bed 2 are operated from the drive shaft through the gearing 5 in the customary manner. I y

The cylinder Bisprovided with a gear 6 which comes into engagement with the gear rack 7 on the bed 2 while the bed is traveling inone direction inthe process of taking a print from the type and is then partly out of engagement with the gear on, the cylinder C.

When the bed is tnaveling in the opposite direction the cylinder B is raised from operative contact with the rack '7'and comes into operative engagement with the gear on cylinder Gthrough means not shown as any means for accomplishing "this can be used and will 'be readily understood by those skilled in the art, and as'this particular action has nothingto do with the invention it is not further described or shown.

When the cylinder B is thus in operative relation with the cylinder Cit transfers the impression on to the second transfer cylinder from which the print is taken on the paper on feed cylinder D.

The cylinder B hasa covering substantially a half-inch in thickness which is composed of a suitable material such as burlap 1 on which is cast a heavy layer of prefer- -erably of an inch in thickness of specially prepared and comparatively soft yielding printers roller material 3. On this in turn is cast a erably of an inch in thickness of specially prepared and perfectly smooth printers roller material 3 which receives the impression from the type.

Thedepression in the roller is about a half-inch in thickness to allow forthis thick coating because if only material of of an inch in thickness was used for instance, it would not give without great pressure and would not spring back into, place Without leaving an indenture inthe surface. Onthe other hand with the thick covering I provide I obtain a yielding material which will give under very light pressure and will spring backinto place without leaving any indentures in the face.

It is importanrtthat this material as I have described it is cast into one piece and not separate layers, because when pressure is applied tothe hard surface the soft bed will recede and spring back with the surface free from any indenture as would appear if separate layers were used.

As the top covering has a hard dull finish without the hardness and glazed face of celluloid it requires very light pressure to take an impression from the type and very light pressure to transfer the impression to the second transfer cylinder, thereby eliminatingevery possibility of thetype sinking into the printing surface or causing the surface'to stretch or heat in the operation.

IVith this construction any amountof pressure can be applied-to the paper and the process permits a greater volume. of. ink to be ,taken. This inkwill not-ibe absorbed- .or dca-denedv but .will .betransferred to another surface ingreater volume.

' 1 The, printing cylinder ,Cfito Ywhich ,this

impression is transferred has a hard; covering of specially prepared printers roller 7 material 4 and this covering is interchangeable with the covering onthe feed cylinder D to which .the'paper'is fed. :The :coyering of the feed cylinder D asshown in the drawing is a metal-Ssuch as zinc and this in turn is interchangeable with the covering of the transfer cylinder C.

' Where a dull print is wanted the second transfer cylinderHC' may be providedwith arubber blanket, and on some grades of printing the best results are obtained byrthe use-0f zinc on this cylinder, in. which case rubber would be used0n the feed cyl- 'inder D.

hen the :typeand cutsused are of posi tive face and also; on: doubleend and rotary press, the feed cylinder-.1) may be dispensed with and the cylinderC becomes both the printing and feed cylinder.

-The artof make-ready as in general use is not scientifically correct and at best is -only-a makeshifta sort of hit and miss proposition that istegrtremely expensive. In

the type press as now in general use, the

print istaken fromtype and cuts directly on to the paper.

v Accordin'glyit requires great skill andtime to get required results and no matter how' true .thetype, cutsand press maysbe, satisfactory printingcannot be done without a make-ready. The reason is that all type and cuts are not-of the same height and the bed of the press will not remain true under great pressure. A

heavy face or cut requires. more pressure ythan light face type and cutsand. all paper us more or less-porous.

- To illustrate this-more clearly -.consider a periodor a. very fine line and it will be realized that very little pressure is. required to print this itermbut a solid, say. an inch .square,. will reqnire many times morepresr re .iisiie va d slrle ed e et illustrated it in oneparticulardesign, I do.

, for said cylinder, a relatively hard outer cylinder.

, transfer cylinder should be alternately earri ed by the type bed and by the cylinder 89 U which. is in contact with it, bothbeing operated through thefm'edium of gear 5,

thereby,- assuring a perfect register.

' While I have described my inventionand notwish it understood that I limit myself to this construction, 'asit is evident that the application 0f the invention may be varied in many ways within the scope of the followingclainis.

I claim- Means for printing comprising a cylinderfa depression for said cylinder, a yielding printers rollen naterial covering surfacing of printers roller material for said covering, a printing cylinderin engagement with said first cylinderand. a feed cylinder in engagement with said second 2. In a printing apparatus of the class described, "a transfer cylinder having a yielding surface of printers roller material,

a thin relatively hard sheet of printers roller material coveringasaid suri'i'ace and a transfer cylinder arranged in co -operation with said transfer cylinder.

v In a printing apparatusxof the class described, a first transfer cylinder having a covering, a second transfer cylinder having a relatively hard sheet printers. roller -mater1al covering sa d cylinder and arfranged in CO-OpQlfltlOll with said first transfer cylinder, afeed cylinder having a carering the said relatively hard sheet. of printers roller ,material covering being interchangeable with ..the said feed cylinder coyering. I 4

4.111 a printing apparatus of the class described, a feed cylinderhaving asmooth 129 surface covering of .metal, afirsttransfer cyllnder, a second transfer cylinder, a cover- 111,9; for sald second transfer cylinder. said last named covering and said metal coveringbeing interchangeable. i p 5. In-a printing apparatus of the class described, comprising atransfer cylinder. a yielding printers roller material coveringsaid cylinder, a hard outerfsurfacing t; p inte are. mater .l r sa mv ing, and a feed cylinder having a relatively hard sheet of printers roller material cover ing, arranged in co-operation with said cylinder, to print from positive face type and 5 plates.

6. In a printing apparatus of the class described, a movable type bed, a first transfer cylinder to receive impressions from the bed, a second transfer cylinder to receive impressions from the first cylinder second transfer cylinder.

' JOHN GONDEK. 

